Extended Surfaces/Fins
Convection: Heat transfer between a solid surface and a moving fluid is governed by the Newton’s cooling law: q = hA(Ts-T?). Therefore, to increase the convective heat transfer, one can
- Increase the temperature difference (Ts-T?) between the surface and the fluid.
- Increase the convection coefficient h. This can be accomplished by increasing the fluid flow over the surface since h is a function of the flow velocity and the higher the velocity, the higher the h. Example: a cooling fan.
- Increase the contact surface area A. Example: a heat sink with fins.